Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
권호 표지

Effect of Dietary Protein and Cysteine Levels on Cadmium Toxicity in Rats

식이 단백질과 cysteine 수준이 흰쥐의 Cadmium 중독에 미치는 영향

  • 김미경 (이화여자대학교 식품영양학과)
  • Published : 1996.06.01
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Abstract

This study was performed to investigate the effect of dietary protein and cysteine levels on cadmium toxicity in rats. Seventy-two male rats of Sprague-Dawley strain weighting 171$\pm$3g were blocked into 12 groups according to body weight, and were raised for 30 days. cadmium chloride was given at levels of 0 or 400ppm, protein at levels of 7, 15 and 40%, and cysteine was added(total dietary cysteine contents : 0.45%) to diet or not. The results are summarized as follow. Food intake, weight gain, food were lower than those of cadmium free group. But, these were increased with increasing dietary protein level and cysteine addition. Fecal cadmium excretion was remarkably increased in high protein (40%) groups. Thus, cadmium retention rates were decreased in high protein groups. Metallothionein concentrations in liver and kidney were increased in cysteine addition, and cadmium administration. Especially, these were remarkably increased in cadmium and cysteine added groups. Urinary calcium excretion was increased with cadmium administration, but urinary protein excretion and creatinine clearance were not changed in these animal. In conclusion, food intake, weight gain and organ weights were decreased with administration. Cadmium toxicity was alleviated by increasing fecal cadmium excretion, while cysteine addition increased metallothionein concentrations in liver and kidney. From these results, it was shown that cadmium toxicity was alliviated by synergistic effect of high protein level and cysteine addition.

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